Angry Malaysian Trapdoor Spider (Liphistius malayanus ♀)

Liphistius spiders are known to be very shy and will often demonstrate their "lighting fast" speed while fleeing. However, it appears that this only applies to smaller individuals.

Larger trapdoor spiders (probably the final instar) tend to be aggressive (raising its body from the ground) and will bite when provoked. I suppose this is how they compensate for the loss in speed- The carapace becomes hardened and thus heavier.

You might not be able to see clearly in this photo, but at 100%, you can see the spider opening up its chelicerae and revealing the sharp fangs as a sign of aggression, ready to bite!